Integral, Measure and Martingale
Every time I think I know what's going on, suddenly there's another layer of complications.
2017年4月12日星期三
rank and anti-rank
x = c(-1, 5, 0, 3, 1, -2)
> rank(x) # "classical" ranking
[1] 2 6 3 5 4 1
> order(x) # anti ranking
[1] 6 1 3 5 4 2
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